Back when all the numbers were at peace, a horrible dictator by the name of 86 rose to power and forced all the numbers into forced labor (which was much more painful for the females mind you...). The ambitious captain 13 took it upon himself to vanquish this evil overlord.
He gathered a huge fighting force, including the brave number 94, the cunning number 6, and the easily confused number 19. They were his chosen few- his captains, and together they rode into battle against 86 and his men. He tried to get the infamous number 69 on his team, but 69 stupidly rejected the offer. Go figure.
The battle was long, and brutal, and a great many numbers of numbers fell bravely.
Including 13 himself, who was slain near the end of the battle after first killing half of 86's army, including 69 and even 86 himself
The end.

If you add the numbers in 13 up you get -3970.
13 is the only number that is written as 13.
13/1=13 no other number divided by 1 equals 13.
You do not have enough fingers to count to thirteen unless you are a Mutant or a Vulcan .
If you count to thirteen by ones you have to say a different number 13 times.
If you are to tired to count to 13 you become unable to count to thirteen.
Thirteen is spelt with less than thirteen letters.
13 is also the age where breasts begin to develop, and thus when men actually start to care about women.